<template>
    <div>
         <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
          <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
          <el-breadcrumb-item>商品管理</el-breadcrumb-item>
          <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!-- 卡片视图区域 -->
      <el-card>
          <!-- 头部警告区域 -->
            <el-alert
                show-icon
                :closable="false"
                title="注意：只允许为第三级分类设置相关参数"
                type="warning">
            </el-alert>
             <!-- 选择商品分类区域 -->
                <el-row class="cat_opt">
                    <el-col>
                        <span>选择商品分类</span>
                        <!-- 选择商品分类的级联选择框 -->
                        <el-cascader
                            v-model="selectedCatekeys"
                            expand-trigger="hover"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-col>
                </el-row>
                <!-- Tab页签区域 -->
                <el-tabs v-model="activeName" @tab-click="handleTabClick">
                    <!-- 添加动态参数的面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <el-button type="primary" size="mini" :disabled="isBtnDisaabled" @click="addDialogVisible = true">添加参数</el-button>  
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTabData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag @close="handleClosed(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                                    <!-- 输入文本框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                        </el-input>
                                        <!-- 添加按钮 -->
                                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                    <!-- 添加静态属性的面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <el-button type="primary" size="mini" :disabled="isBtnDisaabled" @click="addDialogVisible=true">添加属性</el-button> 
                        <!-- 静态属性表格  -->
                        <el-table :data="onlyTabData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag @close="handleClosed(i,scope.row)" closable v-for="(item,i) in scope.row.attr_vals" :key="i">{{item}}</el-tag>
                                    <!-- 输入文本框 -->
                                    <el-input
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                        </el-input>
                                        <!-- 添加按钮 -->
                                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                                </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                    <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>

                    </el-tab-pane>
                </el-tabs>
      </el-card>
      <!-- 添加参数的对话框 -->
      <el-dialog
        title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed"
        >
        <!-- 添加参数的表单 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="50px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!-- 修改参数的对话框 -->
      <el-dialog
        title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed"
        >
        <!-- 修改参数的表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="50px" class="demo-ruleForm">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            // 商品分类列表
            catelist:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定的数组
            selectedCatekeys:[],
            // 被激活的页签名称
            activeName:'many',
            // 动态参数的数据
            manyTabData:[],
            // 静态属性的数据
            onlyTabData:[],
            // 控制添加对话框的显示与隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加参数的表单验证规则
            addFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改表单的规则验证
            editFormRules:{
                attr_name:[
                    {required:true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            // // 控制按钮和文本框的切换显示
            // inputVisible:false,
            // // 文本框中输入的内容
            // inputValue:''



        }
    },
    methods:{
        // 获得所有的商品分类列表
        async getCateList(){
           const {data:res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                this.$message.error('获取商品分类失败！');
            }
            this.catelist = res.data
        },
        // 级联选择框选中变化会触发这个函数
        handleChange(){
            this.getParamsData()

        },
        // 获取参数的参数列表
        async getParamsData(){
            
            // 证明选中的不是三级分类
            if(this.selectedCatekeys.length !== 3){
                this.selectedCatekeys = []
                this.manyTabData = []
                this.onlyTabData = []
                return 
            }
            // 证明选中的是三级分类
            // 根据所选分类的id和当前所处的面板获取对应参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.mta.status !== 200){
                return this.$message.error('获取参数列表失败')
            }
            res.data.forEach(item =>{
                item.attr_vals = item.attr_vals?item.attr_vals.split(' '):[]
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                item.inputValue = ""
            })
            if(this.activeName === 'many'){
                this.manyTabData = res.data
            }else{
                this.onlyTabData = res.data
            }
        },
        // tab页签点击激活所触发的函数
        handleTabClick(){
            this.getParamsData()

        },
        // 监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()

        },
        // 点击按钮添加参数
         addParams(){
            this.$refs.addFormRules.validate(async valid =>{
                if(!valid){
                    return
                }
                const {data:res} = await this.$http.post(`categories/${this.cateId}`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.getParamsData()
            }
            )

        },
        // 点击按钮展示修改的对话框
        async showEditDialog(attrId){
            // 查询当前参数的信息
           const {data:res} = await this.$http.get(`categories/${this.cateId}/attrributes/${attrId}`,
            {params:{attr_sel:this.activeName}}
            )
            if(res.meat.status !== 200){
                return this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true

        },
        // 重置提交的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改参数信息
         editParams(){
             this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })

        },
        // 根据id删除对应的参数项
        async removeParams(attrId){
            const confirmResult = await this.$confirm('此操作将永久删除该参数，是否继续？','提示',{
                confirmButtonText:'确定',
                cancelButtonText:'取消',
                type:'warning'
            }).catch(err => err)
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除')
            }
            const {data:res} =await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败')
            }
            this.$message.success('删除参数成功')
            this.getParamsData()
            
        },
        // 文本框失去焦点或摁下enter键都会触发
        handleInputConfirm(row){
            if(row.inputValue.trim.length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
           

        },
        // 将对attr_vals的操作保存在数据库
        async saveAttrVals(row){
             // 需要发起请求保存操作
            const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功！')

        },
        // 点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick方法的作用就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick( ()=>{
                this.$refs.saveTagInput.$refs.input.focus()
            })

        },
        // 删除对应的参数可选项
        handelClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)

        }

    },
    created(){
        this.getCateList()
    },
    computed:{
        // 如果按钮需要被禁用返回true，否则返回false
        isBtnDisaabled(){
            if(this.selectedCatekeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的ID
        cateId(){
            if(this.selectedCatekeys.length === 3){
                return this.selectedCatekeys[2]
            }
            return null

        },
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }

}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag{
    width: 120px;
}

</style>